Why Do We Get Hiccups?

A hiccup can interrupt you out of nowhere. You’re eating, drinking, laughing, or just sitting there, and suddenly, hic. It’s your normal breathing rhythm briefly interrupted. Your diaphragm contracts when you didn’t tell it to, air starts moving in, and your vocal cords quickly close. That last part is what makes the familiar hiccup sound.

It Starts With Your Diaphragm

Your diaphragm is a large muscle below your lungs that moves as you breathe. Normally, it contracts and relaxes in a steady rhythm, helping pull air into your lungs and then letting it back out.

During a hiccup, the diaphragm suddenly contracts outside that normal rhythm. It’s an involuntary reflex, so you aren’t deciding to take a strange little breath. Your nervous system sets the movement in motion automatically.

That helps explain why hiccups can feel so abrupt. One moment you’re breathing normally, and the next your diaphragm has thrown an unexpected contraction into the pattern.

The “Hic” Actually Comes From Your Throat

The diaphragm starts the hiccup, but it doesn’t make the sound.

When the diaphragm contracts suddenly, air is pulled toward your lungs. Almost immediately, your vocal cords close. That quick closure interrupts the incoming air and produces the short “hic” you hear.

So a hiccup is really two things happening almost back to back: an unexpected contraction of the diaphragm and a quick closure of the vocal cords. The movement starts lower in your body, while the recognizable sound comes from your throat.

Why Hiccups Can Start While You’re Eating Or Drinking

There isn’t always an obvious reason a round of hiccups starts. But the diaphragm and the nerves involved in the hiccup reflex can be affected by changes happening nearby.

Your stomach sits just below the diaphragm, which helps explain the familiar connection between hiccups and eating or drinking. A stomach that stretches as you eat, swallowing air, or drinking something carbonated can sometimes help trigger the reflex.

Laughing or sudden changes in breathing can also be connected to hiccups. That doesn’t mean any one of these things will automatically cause them. It just means ordinary changes involving your breathing, stomach, or nearby nerves can sometimes be enough to set the reflex off.

And sometimes there isn’t an obvious trigger at all. The hiccup still follows the same basic sequence: the diaphragm contracts unexpectedly, the vocal cords close, and your otherwise normal breathing rhythm gets interrupted for a moment.

This article is for informational purposes only and is not a substitute for professional medical advice.